File gnutls-CVE-2015-6251.patch of Package gnutls.1016

commit 272854367efc130fbd4f1a51840d80c630214e12
Author: Nikos Mavrogiannopoulos <nmav@gnutls.org>
Date:   Mon Jul 20 21:49:28 2015 +0200

    Reset the output value on error in _gnutls_x509_dn_to_string()
    
    Reported by Kurt Roeckx.

diff --git a/lib/x509/common.c b/lib/x509/common.c
index 94b6bbc..9a4b96f 100644
--- a/lib/x509/common.c
+++ b/lib/x509/common.c
@@ -469,6 +469,7 @@ _gnutls_x509_dn_to_string(const char *oid, void *value,
 		if (ret < 0) {
 			gnutls_assert();
 			gnutls_free(str->data);
+			str->data = NULL;
 			return ret;
 		}
 		str->size = size;